Authentication system, light emitting device, authentication device and authentication method

Abstract

The invention provides a new authentication system which is capable of not being deceived by copied images and excellent in authentication accuracy and convenience. An image with built-in authentication information to be used for authentication is emitted by an emission angle-dependent light emitting device while being diffracted at a specified angle. An emission angle-dependent light for detector 22 collects a diffracted light, and a control device 23 converts it into an image in the form of an electrical signal. The image in the form of an electrical signal is used for authenticating.

1 . An authentication system comprising: 
 a light emitting device having    display means for displaying an image in which authentication information is incorporated, and    first optical system means for diffracting light of the displayed image at a predetermined angle for each pixel; and    an authentication device having    second optical system means for collecting the light of the image diffracted by the light emitting device,    photoelectric converting means which carries out photoelectric conversion of the collected image, and    control means which carries out authentication using the converted image.    
   
   
       2 . The authentication system according to  claim 1 , wherein the display means and the first optical system means are arranged so that in an image which is displayed by the display means, the image corresponding to the authentication information is diffracted and image other than the authentication information is emitted in a direction substantially perpendicular to a display screen of the display means.  
   
   
       3 . The authentication system according to  claim 1 , wherein the image is displayed from the light emitting device in accordance with to an inquiry signal from the authentication device.  
   
   
       4 . The authentication system according to  claim 1 , wherein the first optical system means and the second optical system means are lens arrays which utilize a one dimensional light distribution.  
   
   
       5 . The authentication system according to  claim 1 , wherein the first optical system means and the second optical system means are lens arrays which utilize a two dimensional light distribution.  
   
   
       6 . The authentication system according to  claim 1 , wherein the image is a hologram pattern.  
   
   
       7 . The authentication system according to  claim 1 , wherein the image is a graphic pattern which does not exhibit hologram effect.  
   
   
       8 . The authentication system according to  claim 1 , wherein the first optical system means is a lens array comprising a plurality of lenses, and gaps are provided between the lenses.  
   
   
       9 . A light emitting device comprising: 
 display means for displaying an image in which authentication information is incorporated; and    optical system means fur diffracting light of the displayed image at a predetermined angle for each pixel.    
   
   
       10 . The light emitting device according to  claim 9 , wherein the display means and the optical system means are arranged so that in the image which is displayed by the display means, the image corresponding to the authentication information is diffracted and the image other than authentication information is emitted in a direction substantially perpendicular to a display screen of the display means.  
   
   
       11 . The light emitting device according to  claim 9 , wherein the image is displayed from the display means in accordance with an inquiry signal from an outside device.  
   
   
       12 . The light emitting device according to  claim 9 , wherein the optical system means is a lens array which utilizes one dimensional light distribution.  
   
   
       13 . The light emitting device according to  claim 9 , wherein the optical system means is a lens array which utilizes two dimensional light distribution.  
   
   
       14 . The light emitting device according to  claim 9 , wherein the image is a hologram pattern.  
   
   
       15 . The light emitting device according to  claim 9 , wherein the image is a graphic pattern which does not exhibit hologram effect.  
   
   
       16 . The light emitting device according to  claim 9 , wherein the optical system means is a lens array comprising a plurality of lenses, and gaps are provided between the lenses.  
   
   
       17 . An authentication device comprising: 
 optical system means for collecting light of an image scattered at a predetermined angle by an outside device;    photoelectric converting means which carries out photoelectric conversion of the collected image; and    control means which carries out authentication using the converted image.    
   
   
       18 . The authentication device according to  claim 17 , wherein an image corresponding to authentication information in the image is diffracted and an image other than the authentication information is not diffracted.  
   
   
       19 . The authentication device according to  claim 17 , wherein an inquiry is made for requesting the outside device to output the image.  
   
   
       20 . The authentication device according to  claim 17 , wherein the optical system means is a lens array which utilizes a one dimensional light distribution.  
   
   
       21 . The authentication device according to  claim 17 , wherein the optical system means is a lens array which utilizes a two dimensional light distribution.  
   
   
       22 . The authentication device according to  claim 17 , wherein the image is a hologram pattern.  
   
   
       23 . The authentication device according to  claim 17 , wherein the image is a graphic pattern which does not exhibit hologram effect.  
   
   
       24 . The authentication device according to  claim 17 , wherein the outside device has an optical system means for diffracting light, said optical system means is a lens array comprising a plurality of lenses, and gaps are provided between the lenses.  
   
   
       25 . An authentication method comprising the steps of: 
 displaying, from display means, an image in which authentication information is incorporated,    diffracting light of the displayed image at a predetermined angle for each pixel by first optical system means,    collecting, by second optical system means, light of the image diffracted by the first optical system means,    carrying out photoelectric conversion of the collected image by photoelectric converting means, and    carries out authentication by control means using the converted image.    
   
   
       26 . The authentication method according to  claim 25 , wherein the display means and the first optical system means are arranged so that in the image which is displayed by the display means, the image corresponding to the authentication information is diffracted and the image other than authentication information is emitted in a direction substantially perpendicular to a display screen of the display means.  
   
   
       27 . The authentication method according to  claim 25 , wherein the image is displayed from the display means in response to an inquiry.  
   
   
       28 . The authentication method according to  claim 25 , wherein the first optical system means and the second optical system means are lens arrays which utilize a one dimensional light distribution.  
   
   
       29 . The authentication method according to  claim 25 , wherein the first optical system means and the second optical system means are lens arrays which utilize a two dimensional light distribution.  
   
   
       30 . The authentication method according to  claim 25 , wherein the image is a hologram pattern.  
   
   
       31 . The authentication method according to  claim 25 , wherein the image is a graphic pattern which does not exhibit a hologram effect.  
   
   
       32 . The authentication method according to  claim 25 , wherein the first optical system means is a lens array comprising a plurality of lenses, and gaps are provided between the lenses.